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1. Consider the following two MA (2) models: ·zt = (1-1.3B + AB*)et with σ-10.0, . x,-(1-1.75B+ .625B2)et with σ-64. (i) Evaluate the autocovariances a,k for lags k 0,1,2 for both models to verify that they have the same acf. [5 marks] (ii) However, only one of these two models is invertible. Which one? 5 marks

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